CONTROL OF BARLEY LEAF STRIPE (Drechslera graminea) BY FUNGICIDAL SEED TREATMENTS

Abstract

Four systemic fungicides used as seed dressings were evaluated against barley leaf stripe disease caused by Drechslera graminea This evaluation was carried out at Gemmeiza Agric. Res. Station in 2006/07 and 2007/08 seasons to identify a suitable fungicide to control barley leaf stripe. Under laboratory conditions, the tested fungicides had not phytotoxic effects on seed germination of Giza123 cultivar, since germination % of seed ranged from 98.32 to 98.83 %. Under field conditions, no significant differences were found between the fungicides Tetraconazole ( Bremis) and Diniconazole( sumi-8) in controlling the disease. Tetraconazole (2 cm/kg seed) , Diniconazole (1.5 cm/kg seed) and Teboconazole (1.2cm/kg seed) provided the best efficacy % of barley leaf stripe control releasing 96.29, 96.19 and 96.06 % efficacy, respectively. On the other hand , Semiconazole (1 gm/kg seed) showed the lowest efficacy % in this respect(87.83%, ) . Grain yield expressed as spike weight and grain yield /m 2 was associated with fungicide efficacy. Tetraconazole (Bremis, 2.5%) showed the highest average of spike weight and grain yield /m 2 (4.98 and 258.50 gm, respectively ), while, Semiconazole (sunlit) showed the lowest average (3.83 and 187.46 gm, respectively).High correlation was found between efficacy of fungicides and both of increase % of spike weight (r = 0.9793) and Increase % of grain weight /m 2 (r = 0.9999).